Suppression of efficiency roll-off in TADF-OLEDs using Ag-island nanostructures with localized surface plasmon resonance effect |
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| Affiliation: | 1. School of Physics and Optoelectronic Engineering, Xidian University, Xi''an, 710071, People''s Republic of China;2. Key Laboratory of Photonics Technology for Information, Department of Electronic Science and Technology, School of Electronic and Information Engineering, Xi''an Jiaotong University, Xi''an, 710049, People''s Republic of China;3. Department of Chemistry, School of Science, Xi''an Jiaotong University, Xi''an, 710049, People''s Republic of China;1. Departamento de Química Física y Termodinámica Aplicada, Instituto Universitario de Investigación en Química Fina y Nanoquímica IUIQFN, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, E-14071 Córdoba, Spain;2. Institute of Molecular Science (IcMol), University of Valencia, P.O. Box 22085, E-46071 Valencia, Spain;1. Centre for Nanoscience and Nanotechnology, School of Physics, Bharathidasan University, Tiruchirappalli, Tamil Nadu 620 024, India;2. Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka 432-8011, Japan |
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| Abstract: | Organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) have emerged as promising alternatives to phosphorescent OLEDs for harvesting both singlet and triplet excitons. However, the development of TADF-OLEDs meets a thorny problem of serious efficiency roll-off at high luminance. Here, we demonstrate an approach to suppress the efficiency roll-off characteristics in TADF-OLEDs by localized surface plasmon resonance (LSPR) effect of easy-fabricated Ag-island nanostructures. Compared with the common TADF-OLEDs at a high current density of 100 mA cm−2, the efficiency roll-off ratio of the TADF-OLEDs with Ag-island nanostructures decreases from 49.75% to 35.76% significantly, and the maximum current efficiency is increased by 10.5%. The performance enhancement is mainly attributed to the coupling between excitons and localized surface plasmons (LSPs), which could alter the excited state kinetic characteristics of TADF molecules. |
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| Keywords: | Thermally activated delayed fluorescence Efficiency roll-off Localized surface plasmon resonance Ag-island nanostructures Excited state |
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